MAZDA6 (2.3L)
- Connected scan tool to DLC-2. Turn ignition on, engine off. Select BARO PID. Verify BARO PID and barometric pressure are practically equal. If as verified, go to next step. If not as verified, check for open or short circuit. Go to step 3.
- Apply vacuum of -7.38 in. Hg to BARO sensor, and verify BARO PID (pressure) from that of step 1) is about 7.38 in. Hg. If not as verified, check for open or short circuit. Go to next step.
- Open Circuit Inspection
Disconnect Barometric Pressure (BARO) sensor 3-pin harness connector. See Fig 1. Disconnect PCM harness connectors. Check for continuity between following terminals:- BARO sensor 3-pin harness connector terminal "A" and PCM 30-pin harness connector terminal No. 1G (Pink wire).
- BARO sensor 3-pin harness connector terminal "B" and PCM 30-pin harness connector terminal No. 2H (Brown wire).
- BARO sensor 3-pin harness connector terminal "C" and PCM 30-pin harness connector terminal No. 2K (Red/Black wire).
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.
- Short Circuit Inspection
Check for continuity between following:- BARO sensor 3-pin harness connector terminal "C" (Red/Black wire) and power supply.
- BARO sensor 3-pin harness connector terminal "C" (Red/Black wire) and ground.
- BARO sensor 3-pin harness connector terminal "A" (Pink wire) and power supply.
- BARO sensor 3-pin harness connector terminal "A" (Pink wire) and ground.
If continuity is present, repair short circuit in suspect wire or replace wire harness. If open or short circuit is not present, replace BARO sensor.